[App banners] Add UMA metrics

chrome/browser/banners/app_banner_settings_helper.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/banners/app_banner_settings_helper.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/command_line.h"
+#include "chrome/browser/banners/app_banner_metrics.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_switches.h"
 #include "components/content_settings/core/browser/host_content_settings_map.h"
 #include "components/content_settings/core/common/content_settings_pattern.h"
 #include "content/public/browser/web_contents.h"
 #include "net/base/escape.h"
 #include "url/gurl.h"
 
 namespace {
 
@@ skipping 160 matching lines @@
     base::Time time) {
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kBypassAppBannerEngagementChecks)) {
     return true;
   }
 
   // Don't show if it has been added to the homescreen.
   base::Time added_time =
       GetSingleBannerEvent(web_contents, origin_url, package_name_or_start_url,
                            APP_BANNER_EVENT_DID_ADD_TO_HOMESCREEN);
-  if (!added_time.is_null())
+  if (!added_time.is_null()) {
+    banners::TrackDisplayEvent(banners::DISPLAY_EVENT_INSTALLED_PREVIOUSLY);
     return false;
+  }
 
   base::Time blocked_time =
       GetSingleBannerEvent(web_contents, origin_url, package_name_or_start_url,
                            APP_BANNER_EVENT_DID_BLOCK);
 
   // Null times are in the distant past, so the delta between real times and
   // null events will always be greater than the limits.
   if (time - blocked_time <
       base::TimeDelta::FromDays(kMinimumBannerBlockedToBannerShown)) {
+    banners::TrackDisplayEvent(banners::DISPLAY_EVENT_BLOCKED_PREVIOUSLY);
     return false;
   }
 
   base::Time shown_time =
       GetSingleBannerEvent(web_contents, origin_url, package_name_or_start_url,
                            APP_BANNER_EVENT_DID_SHOW);
   if (time - shown_time <
       base::TimeDelta::FromDays(kMinimumDaysBetweenBannerShows)) {
+    banners::TrackDisplayEvent(banners::DISPLAY_EVENT_IGNORED_PREVIOUSLY);
     return false;
   }
 
   std::vector<base::Time> could_show_events = GetCouldShowBannerEvents(
       web_contents, origin_url, package_name_or_start_url);
-  return could_show_events.size() >= kCouldShowEventsToTrigger;
+  if (could_show_events.size() < kCouldShowEventsToTrigger) {
+    banners::TrackDisplayEvent(banners::DISPLAY_EVENT_NOT_VISITED_ENOUGH);
+    return false;
+  }
+
+  return true;
 }
 
 std::vector<base::Time> AppBannerSettingsHelper::GetCouldShowBannerEvents(
     content::WebContents* web_contents,
     const GURL& origin_url,
     const std::string& package_name_or_start_url) {
   std::vector<base::Time> result;
   if (package_name_or_start_url.empty())
     return result;
 
@@ skipping 117 matching lines @@
       GetAppDict(origin_dict.get(), package_name_or_start_url);
   if (!app_dict)
     return;
 
   // Update the setting and save it back.
   app_dict->SetBoolean(kHasBlockedKey, true);
   settings->SetWebsiteSetting(pattern, ContentSettingsPattern::Wildcard(),
                               CONTENT_SETTINGS_TYPE_APP_BANNER, std::string(),
                               origin_dict.release());
 }